WO1991006148A1 - Systeme d'annulation selectif en circuit - Google Patents

Systeme d'annulation selectif en circuit Download PDF

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Publication number
WO1991006148A1
WO1991006148A1 PCT/US1990/005823 US9005823W WO9106148A1 WO 1991006148 A1 WO1991006148 A1 WO 1991006148A1 US 9005823 W US9005823 W US 9005823W WO 9106148 A1 WO9106148 A1 WO 9106148A1
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WO
WIPO (PCT)
Prior art keywords
signal
active cancellation
primary
mixer
residual error
Prior art date
Application number
PCT/US1990/005823
Other languages
English (en)
Inventor
Eldon W. Ziegler, Jr.
John W. Gardner
Original Assignee
Noise Cancellation Technologies, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Noise Cancellation Technologies, Inc. filed Critical Noise Cancellation Technologies, Inc.
Publication of WO1991006148A1 publication Critical patent/WO1991006148A1/fr
Priority to KR1019920700886A priority Critical patent/KR100229095B1/ko

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B1/00—Details
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H21/00—Adaptive networks
    • H03H21/0001—Analogue adaptive filters

Definitions

  • the present invention relates generally to active cancellation systems for repetitive phenomena, and more specifically to a selective active cancellation system in which the cancellation takes place within an electronic circuit, i.e., in-wire.
  • Prior art analog notch filters are difficult to tune as the frequencies to be rejected change, require tight tolerances of components and often require non-standard values for components to select precisely the frequency to be rejected and have a small bandwidth.
  • Prior art active cancellation systems have required a sensor, such as a microphone, to detect the noise and an actuator, such as a speaker, to produce the cancelling antinoise.
  • the present invention is directed toward eliminating the sensor and actuator for the cancellation of repetitive noise within communications, surveillance and related systems.
  • Linear flow, air duct systems for example, Chaplin U.S. Patent 4,122,303; Warnaka U.S. Patent 4,473,906 and Eriksson U.S. Patents 4,677,676 and 4,677,677, take advantage of directional flow in linear, one dimensional flow to utilize an upstream sensor, followed by a cancellation actuator and downstream error sensor in sequence. These systems cancel repetitive and random noise.
  • Chaplin characterizes the control as a general convolution process, including a "programme of time-related operational steps.” Warnaka uses adaptive filters to speed adaptation time and allow greater spacing between the speaker and the duct.
  • Erikkson specifies recursive least means square (RLMS) and least means square (LMS) adaptive filters to perform the convolutions and measure the system transfer function sin the presence of noise.
  • RLMS recursive least means square
  • LMS least means square
  • Chaplin U.S. Patents 4,153,815 and 4,417,098 describe the use of a synchronizing timing signal to provide selective cancellation of repetitive noise or vibration. Additionally a controller, actuator and error sensor are used. The method presented by Chaplin in these patents divides the noise or vibration period into a number of intervals and adjusts the amplitude of the canceling signal within each interval in response to the sign or amplitude of the error sensor within the same or a delayed interval.
  • Chaplin describes the use of Fourier transforms to process signals in the frequency domain. While this method might be used for random signals, processing time requirements generally limit its application to repetitive signals.
  • Cancellation of unwanted components within electronic signals generally is applied to communication signals. Renneck et al. in U.S. Patent 4,232,381, use a commutation filter synchronized to the rotation of an engine to cancel self-generated engine noise within an electronic circuit. The level of the canceling signal is adjusted manually and no method is provided to adapt to phase shifts or varying amplitudes of different harmonics.
  • Garconnat et al. in U.S. Patent 4,594,694 use two sensors, one sensing both the wanted and unwanted signals and the other sensing only the unwanted signals. Narrow band filters or Fourier transforms are used to eliminate the unwanted signals from the combined signal.
  • Each of Widrow's techniques requires a sensor for the reference signal, a sensor for the primary signal and a sensor for the error signal and requires that the cancellation take place numerically within the processor.
  • the processor and associated elements must have sufficient bandwidth for all frequency components of the signal, not just those components to be cancelled.
  • the cancellation controller contains all necessary filters, including antialiassing filters and reconstruction filters. Since the primary signal containing both the noise and intelligence is not passed through the cancellation controller, the intelligence signal component is not degraded by the controller filters and other circuitry. The primary signal is thus only affected by the repetitive noise cancelling signal fed to the electric mixer.
  • Figure 1 schematically depicts a prior art adaptive noise cancellation system
  • Figure 2 is a schematic circuit diagram of a single frequency adaptive notch filter of the prior art Figure 1 system.
  • Figure 3 is a block diagram of a selective active cancellation system constructed according to a preferred embodiment of the present invention.
  • Figure 4 is a schematic diagram of a circuit combining the level shifters and electron mixer of the Figure 3 system, constructed to a preferred embodiment of the present invention.
  • Figure 1 depicts a prior art approach to eliminating repetitive noise from electronic signals using analog notch or comb filters to remove all signals within bands around each frequency component to be eliminated.
  • the signal from a signal source and an unwanted noise source is combined as a primary input to an analog filter circuit.
  • the analog filter circuit includes an adaptive filter supplied with a reference input signal n from the noise source and an error signal error at the system output E.
  • the output y from the filter is added (subtracted) at the adder or summer.
  • Figure 2 depicts the circuit, for the filter circuit outlined in dash lines in Figure 1.
  • cancellation controllers produce the effects of notch widths down to a few Hertz. Furthermore, these controllers adjust the phase and amplitude of the cancelling signal to match only the frequency components of the primary signal that are correlated with the frequencies to be cancelled. Thus, the impact of the cancellation on the intelligence in the primary signal is minimized.
  • FIGS. 3 and 4 depict preferred embodiments of the present invention.
  • the timing signal 102 sets the fundamental frequency, f Q , to be cancelled by the selective active cancellation controller 103 and the optional operator interface 104 is used to select the range of frequencies within which the harmonics of f Q will be cancelled.
  • the primary signal 101 containing both the undersired repetitive noise and the desired intelligence is shifted in level by level shifter 105 to match the level of the cancellation output of controller 103.
  • the mixer 106 combines the primary signal and the cancellation signal to produce an output signal containing only the intelligence of the primary signal.
  • the level shifter 107 sets the desired output level for the modified primary signal and the level shifter 108 matches the output level to the required level for the residual, error, input to the active cancellation controller 103.
  • Figure 4 shows a circuit combining the functions of the level shifters and the mixer.
  • Level shifter 105 is manually adjusted in this circuit and is composed of Ul, CR1, Cl, SW1, Rl thru R4 and R12 thru R19.
  • CR1, Rl and Cl serve to protect Ul and AC couple the primary signal.
  • SW1 selects one of R12 through R19 along with R2 to set the gain of Ul which is fine adjusted by R3 and R4.
  • Ul is an instrumentation amplifier such as the AMP-01 by Precision Monolithics, Inc.
  • U2 and R5 thru R8 form the mixer 106 combining the level shifted primary signal and the cancellation output signal from the active cancellation controller 103.
  • U2 is general purpose or other Op-Amp as required by the primary signal.
  • Level shifter 107 is provided by R9 while RIO and Rll provide level shifter 108.
  • the active cancellation controller 103 contains all necessary filters, including anti-aliasing filters and reconstruction filters. Thus, the primary signal does not pass thru these filters and is unaffected except for cancellation of the repetitive noise.

Abstract

Système d'annulation active en circuit permettant d'annuler des composantes de signal répétitives indésirables d'un signal électronique primaire comprenant des composantes de signal intelligentes voulues ainsi que des composantes de signal répétitives indésirables. Le signal (101) électronique primaire est transmis en tant qu'entrée à un mélangeur (106) électronique. Une seconde entrée dudit mélangeur (106) électronique reçoit un signal d'annulation répétitive généré par un contrôleur (103) d'annulation active, destiné à annuler la composante du signal répétitive indésirable du signal (10) primaire, sans gêner le passage des composantes de signal intelligentes du signal primaire.
PCT/US1990/005823 1989-10-16 1990-10-16 Systeme d'annulation selectif en circuit WO1991006148A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019920700886A KR100229095B1 (en) 1989-10-16 1992-04-16 In-wire selective active cancellation system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/421,759 US5126681A (en) 1989-10-16 1989-10-16 In-wire selective active cancellation system
US421,759 1989-10-16

Publications (1)

Publication Number Publication Date
WO1991006148A1 true WO1991006148A1 (fr) 1991-05-02

Family

ID=23671931

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1990/005823 WO1991006148A1 (fr) 1989-10-16 1990-10-16 Systeme d'annulation selectif en circuit

Country Status (7)

Country Link
US (1) US5126681A (fr)
EP (1) EP0496797A4 (fr)
JP (1) JPH05501488A (fr)
KR (1) KR100229095B1 (fr)
AU (1) AU643714B2 (fr)
CA (1) CA2067822C (fr)
WO (1) WO1991006148A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5638022A (en) * 1992-06-25 1997-06-10 Noise Cancellation Technologies, Inc. Control system for periodic disturbances

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US5355091A (en) * 1992-05-21 1994-10-11 The United States Of America As Represented By The Secretary Of The Army Apparatus for real time interference signal rejection
WO1993026085A1 (fr) * 1992-06-05 1993-12-23 Noise Cancellation Technologies Casque d'ecoute actif/passif a filtre vocal
WO1993026083A1 (fr) * 1992-06-05 1993-12-23 Noise Cancellation Technologies, Inc. Casque d'ecoute passif selectif
US5732143A (en) * 1992-10-29 1998-03-24 Andrea Electronics Corp. Noise cancellation apparatus
JP2750084B2 (ja) * 1993-05-19 1998-05-13 三星電子株式会社 真空掃除機の騒音制御装置
DE4421853A1 (de) * 1994-06-22 1996-01-04 Philips Patentverwaltung Mobilfunkendgerät
US5502770A (en) * 1993-11-29 1996-03-26 Caterpillar Inc. Indirectly sensed signal processing in active periodic acoustic noise cancellation
US5737433A (en) * 1996-01-16 1998-04-07 Gardner; William A. Sound environment control apparatus
US6278786B1 (en) 1997-07-29 2001-08-21 Telex Communications, Inc. Active noise cancellation aircraft headset system
US6094623A (en) * 1998-03-25 2000-07-25 The Governors Of The University Of Alberta Non-linear digital adaptive compensation in non-ideal noise environments
US6363345B1 (en) 1999-02-18 2002-03-26 Andrea Electronics Corporation System, method and apparatus for cancelling noise
US6594367B1 (en) 1999-10-25 2003-07-15 Andrea Electronics Corporation Super directional beamforming design and implementation
DE10018666A1 (de) 2000-04-14 2001-10-18 Harman Audio Electronic Sys Vorrichtung und Verfahren zum geräuschabhängigen Anpassen eines akustischen Nutzsignals
US20040125962A1 (en) * 2000-04-14 2004-07-01 Markus Christoph Method and apparatus for dynamic sound optimization
US6978010B1 (en) * 2002-03-21 2005-12-20 Bellsouth Intellectual Property Corp. Ambient noise cancellation for voice communication device
EP1580882B1 (fr) * 2004-03-19 2007-01-10 Harman Becker Automotive Systems GmbH Système et procédé d'amélioration audio
EP1833163B1 (fr) * 2004-07-20 2019-12-18 Harman Becker Automotive Systems GmbH Système d'amélioration audio et son procédé
US8170221B2 (en) * 2005-03-21 2012-05-01 Harman Becker Automotive Systems Gmbh Audio enhancement system and method
EP1720249B1 (fr) 2005-05-04 2009-07-15 Harman Becker Automotive Systems GmbH Système et methode de renforcement audio
US20070041606A1 (en) * 2005-08-22 2007-02-22 David Clark Company Incorporated Apparatus and method for noise cancellation in communication headset using dual-coil speaker

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US4589137A (en) * 1985-01-03 1986-05-13 The United States Of America As Represented By The Secretary Of The Navy Electronic noise-reducing system
US4658426A (en) * 1985-10-10 1987-04-14 Harold Antin Adaptive noise suppressor
US4672674A (en) * 1982-01-27 1987-06-09 Clough Patrick V F Communications systems

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US4899389A (en) * 1987-02-17 1990-02-06 Clarion Co., Ltd. Pulsating noise removal device
US4726035A (en) * 1987-03-26 1988-02-16 Unisys Corporation Analog/digital adaptive line enhancer
DE3840999A1 (de) * 1988-12-06 1990-06-07 Blaupunkt Werke Gmbh Schaltungsanordnung zur unterdrueckung schmalbandiger stoersignale

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US4672674A (en) * 1982-01-27 1987-06-09 Clough Patrick V F Communications systems
US4589137A (en) * 1985-01-03 1986-05-13 The United States Of America As Represented By The Secretary Of The Navy Electronic noise-reducing system
US4658426A (en) * 1985-10-10 1987-04-14 Harold Antin Adaptive noise suppressor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5638022A (en) * 1992-06-25 1997-06-10 Noise Cancellation Technologies, Inc. Control system for periodic disturbances

Also Published As

Publication number Publication date
KR920704409A (ko) 1992-12-19
AU643714B2 (en) 1993-11-25
JPH05501488A (ja) 1993-03-18
EP0496797A4 (en) 1993-12-15
CA2067822C (fr) 1998-09-15
AU6616490A (en) 1991-05-16
CA2067822A1 (fr) 1991-04-17
KR100229095B1 (en) 1999-11-01
EP0496797A1 (fr) 1992-08-05
US5126681A (en) 1992-06-30

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